摘要
ＭｏＯ２Ｂｒ２－Ａｌ（ｉ－Ｂｕ）２ＯＰｈＣＨ３（－ｍ）体系催化丁二烯１，２－聚合过程中添加Ｃ３Ｈ５Ｘ（Ｘ＝Ｃｌ、Ｂｒ和Ｉ）对聚合物分子量有较好的调节作用，其中以Ｃ３Ｈ５Ｂｒ的调节作用最强，Ｍｎ从１７．５×１０５降至３．５×１０５，但对催化活性有一定的影响．在测定催化体系的ＵＶ光谱、（１３）Ｃ－ＮＭＲ谱、聚合活性和聚合动力学参数的基础上，讨论了Ｃ３Ｈ５Ｘ在催化体系中的行为．
he effect of CH2 = CH - CH2X (X=Cl,Br and I ) on polymerization activity and molecular weight of polymer has been studied in molybdenum catalyst system for 1,2-- polymerization of butadiene. The functions of CH2=CH -- CH2Br among three kind of allyl--halogen are the best for the catalytic activity and the regulation of molecular weight of 1, 2-- polybutadiene from Mn= 3. 5 × 105 to 17. 5×105. From the data obtained by 13C--nmr and UV spectra of CH2= CH -- CH2X and butadiene molecules as well as parameters of polymerization activity and kynetics it was propose that a frequency mechanismwhich was under the control of the molecular weight of polymer existed in the reactions between complexing reaction and discompleking reaction, i.e.
出处
《高分子学报》
SCIE
CAS
CSCD
北大核心
1994年第5期513-519,共7页
Acta Polymerica Sinica
基金
国家自然科学基金
关键词
二溴二氧化钼
丁二烯
催化
卤素
MoO_2Br_2, Zieglar-Natta catalyst, Polymerization of butadiene,Allyl-Holagen
